Research conducted by G.J. Gorbsky and colleagues suggests that during anaphase, chromosomes
move as a consequence of ____.
a. a combined action of actin and microtubules
b. the disassembly of kinetochore microtubules
c. the movement of kinetochore microtubules
d. constriction of the contractile protein actin
e. sliding over or along kinetochore microtubules
E
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A cleaning solution used on the venipuncture site to avoid skin contamination of the blood sample is called a(n):
a. surfactant. b. disinfectant. c. biocide. d. antiseptic.
Bartel and Szostak hypothesized that among a large pool of RNA molecules, some of them may contain the enzymatic ability to catalyze a covalent bond between nucleotides; these can be selected for in the laboratory. The chart below shows the results from their experiment. The x-axis shows the original pool and 10 pools that were derived from their tagging of RNA with specific enzymatic functions; the y-axis shows the rate of phosphoester (covalent) bond formation. Was their hypothesis supported by this experiment and why?
A. Yes, because pools 1 to 10 show a continual increase in covalent bond formation.
B. Yes, because the original pool shows some covalent bonds were formed.
C. No, because there is only a slight increase from the original pool to the first experimental pool.
D. No, because chemical selection would only increase the rate of covalent bond formation in the first few pools.
List the most abundant ions in seawater, from most to least abundant
What will be an ideal response?
Which of the following occurs when intra-alveolar pressure exceeds atmospheric pressure?
A) Air moves into the lung. B) Air moves out of the lung. C) Intrapleural pressure is greater than intra-alveolar pressure. D) The lung must be expanding. E) The lung collapses.